It's available for both droid and icrap...
http://www.line2.comI have an iPhone4 that I am either going to sell in short order and break the contract with AT&T on or I am going to use it for target practice and still break the contract on but keep the number. I would like to keep the number since I have had it for a while and have several friends and customers that call me on it alone.
So with that said I know all about Google Voice...have been using it on the iphone and don't really like it since half the time it garbles the voicemails and doesn't provide me with a clear text version of the message and I have to dial in and listen to the message anyway.